$re = '/((?![\s\-обед])[а-я]{2,3}|[а-я]{2,3}-[а-я]{2,3})[:\s]+([\d:\-]+)/m';
$str = 'пн: 10:00-19:00, обед: 14:00-15:00 вт: 10:00-19:00, обед: 14:00-15:00 ср: 10:00-19:00, обед: 14:00-15:00 чт: 10:00-19:00, обед: 14:00-15:00 пт: 10:00-19:00, обед: 14:00-15:00 сб: 10:00-14:00, обед: 14:00-15:00
пн-вск 20-22';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php